Plastic bucket processing technology

Abstract

The invention relates to the technical field of plastic bucket processing, in particular to a plastic bucket processing technology which comprises the following specific steps: S1, plastic bucket modeling: making a plastic bucket model by utilizing three-dimensional software; s2, decomposing the plastic bucket: decomposing a three-dimensional model of a bucket body and an opening part by utilizing the plastic bucket model through three-dimensional software, and designing a connecting structure connected with the bucket body on the opening part; s3, opening part injection mold model design: designing a three-dimensional model of an opening part injection mold required by injection molding of an opening part through three-dimensional software; s4, designing a barrel body blowing mold model; s5, manufacturing a solid mold; s6, manufacturing an opening part; s7, checking and mounting an opening part; s8, the barrel body and the opening part are combined; and S9, cooling and finishing. The device has the effect of improving the qualification rate of the plastic barrels.

Description

Technical Field

[0001] The present application relates to the technical field of plastic barrel processing, and in particular to a plastic barrel processing technology. Background Art

[0002] In the industrial production of plastic barrels, mold technology is the core link in achieving efficient and low-cost manufacturing. Traditional plastic barrels are mostly produced using injection molding or blow molding processes, with the barrel body and opening structure formed by a one-piece mold.

[0003] Related art discloses a plastic bucket, referring to Figure 2 , including a barrel body 31 and an opening 32, the opening 32 is integrally formed on the barrel body 31, a thread 33 is integrally formed on the outer wall of the opening, and a groove 35 for accommodating the opening 32 is provided on the barrel body 31, and the end of the opening 32 facing away from the barrel body 31 is lower than the side of the barrel body 31.

[0004] However, when manufacturing openings (such as threaded openings) in conventional molds, the openings are typically integrally formed with the barrel body. However, the hot melt material extruded by the screw extruder expands differently at different locations within the blow mold cavity. This results in inconsistent wall thickness at different locations in the plastic barrel, particularly in the opening area, where the wall thickness can be too thin or too thick. A thin opening can also lead to insufficient mechanical strength. Frequent opening and closing can cause deformation, leading to thread failure and compromised sealing. This ultimately results in a low pass rate for the produced plastic barrels, thus presenting several deficiencies. Summary of the Invention

[0005] In order to improve the problem of low qualification rate of plastic barrels produced by traditional blow molding process, the present application provides a plastic barrel processing technology.

[0006] The plastic barrel processing technology provided in this application adopts the following technical solutions: A plastic barrel processing technology, the specific steps are as follows: S1. Plastic barrel modeling: Use 3D software to make a plastic barrel model; S2. Plastic barrel decomposition: Use 3D software to decompose the 3D model of the barrel body and the opening using the plastic barrel model, and design a connection structure on the opening for connecting to the barrel body; S3. Opening injection mold model design: Use 3D software to design the 3D model of the opening injection mold required for injection molding the opening; S4. Barrel body blow molding mold model design: Use 3D software to design the 3D model of the blow molding mold required for blow molding the barrel body, and design a positioning groove for placing the opening on the 3D model of the blow molding mold; S5. Solid mold production: Use the 3D model of the injection mold and the 3D model of the blow molding mold to produce the injection mold for producing the opening and the blow molding mold for molding the opening on the barrel body; S6. Opening production: Use the injection mold and the injection molding machine to inject the solid Opening; S7. Inspection and installation of the opening: Use professional testing equipment to check the size, thickness and surface condition of the entity opening after injection molding, and then install the qualified opening on the positioning groove of the blow mold; S8. Combination of the barrel body and the opening: The extruder extrude a hot-melt adhesive blank with an internal hollow into the blow mold. The hot-melt adhesive blank and the opening are made of the same material. The blowing mechanism on the blow mold blows air into the hot-melt adhesive blank. The hot-melt adhesive blank continues to expand and fits to the opening on the positioning groove until the hot-melt adhesive blank completely fits the inner cavity of the blow mold. At this time, the outer wall of the hot-melt adhesive blank that fits the opening will gradually wrap around the connecting structure on the opening due to expansion; S9. Cooling and trimming: The cooling equipment cools down the blow mold. The hot-melt adhesive blank will continue to cool and form a whole with the opening, eventually forming a plastic barrel. Afterwards, the plastic barrel is taken out and the excess material is trimmed.

[0007] By adopting the above technical solution, the opening is first processed using the manufactured injection mold and injection molding machine, and then the opening of qualified quality is placed on the positioning groove in the blow mold. Then the extruder extrude the hollow hot melt adhesive blank into the blow mold, and then the blowing mechanism blows air into the hot melt adhesive blank. The hot melt adhesive blank expands and gradually fits the opening until the hot melt adhesive blank completely fits the inner cavity of the blow mold. At this time, the opening is at room temperature, so the volume will not change, but the local outer wall of the expanded hot melt adhesive blank will be wrapped around the connecting structure of the opening. Since the opening and the hot melt adhesive blank are made of the same material, when the hot melt adhesive blank cools, the opening will be solidified on the barrel body formed by the cooling of the hot melt adhesive blank. The plastic barrel formed by this process has qualified structural strength of the opening, so the deformation of the opening of the produced plastic barrel is greatly reduced, thereby improving the qualified rate of the plastic barrel.

[0008] Optionally, the plastic barrel modeling steps are as follows: according to the size and wall thickness of the plastic barrel design drawing, the plastic barrel is accurately modeled using three-dimensional software.

[0009] By adopting the above technical solution, it is convenient to subsequently split the plastic barrel model, thereby making the subsequently produced plastic barrels more accurate in size.

[0010] Optionally, the steps of disassembling the plastic barrel are as follows: firstly disassemble the barrel body and the opening according to the model of the plastic barrel, and then design a connection structure on the opening for splicing with the barrel body according to the designed wall thickness of the barrel body.

[0011] By adopting the above technical solution, the pre-produced opening can be better consolidated with the barrel body formed by subsequent blow molding, which is beneficial to improving the structural strength between the opening and the barrel body.

[0012] Optionally, the steps for designing the injection mold model of the opening are as follows: based on the characteristics that the opening is open at both ends and has threads on the circumferential outer side, multiple parts are assembled together, and at the same time, the multiple parts are made to jointly form an injection cavity for injecting the opening, and an injection tube for connecting to the discharge end of the injection molding machine is designed on one of the parts, and the injection tube is connected to the injection cavity.

[0013] By adopting the above technical solution, the complex injection mold model is disassembled into multiple simple parts, and the injection molding process of the complex shape of the opening is completed by piecing together multiple simple parts, thereby reducing the difficulty of subsequent processing of the solid injection mold.

[0014] Optionally, the steps for designing the barrel body blow molding mold model are as follows: decompose the three-dimensional model of the barrel body into two parts that are easy to demold, then design a first mold and a second mold according to the structures of the two parts respectively, and design a positioning groove for placing the opening on the first mold, and then design a driving part to drive the first mold to reciprocate towards or away from the second mold.

[0015] By adopting the above technical solution, the difficulty of making the blow mold is reduced, and at the same time, the demoulding of the barrel body produced subsequently is facilitated.

[0016] Optionally, the steps for making the physical mold are as follows: selecting the material for making the mold, and using professional processing equipment to make the injection mold and blow mold of corresponding sizes according to the sizes of the injection mold and the blow mold.

[0017] By adopting the above technical solution, the difficulty of workers in making injection molds and blow molds is reduced, and at the same time, the dimensional accuracy of the opening and barrel body in subsequent production is improved.

[0018] Optionally, the steps for making the opening are as follows: injecting molten material into the injection mold through an injection molding machine, and after the injected molten material cools down, taking out the opening and performing surface structure trimming.

[0019] By adopting the above technical solution, workers first assemble multiple parts together to form an injection molding chamber, and then the injection molding machine injects molten material into the injection molding chamber through the injection molding tube. When the molten material cools down, the workers disassemble the multiple parts and take out the opening formed by cooling, and then trim the opening to finally obtain a qualified opening, thereby controlling the stability of the structural strength of the opening finally formed on the plastic barrel.

[0020] Optionally, the steps for combining the barrel body and the opening are as follows: first, place the qualified opening on the positioning groove of the first mold, then, the hot melt adhesive blank extruded by the extruder drops between the first mold and the second mold, and then, the driving member drives the first mold and the second mold closer to each other, and finally the first mold and the second mold clamp the hot melt adhesive blank off, and the blowing mechanism on the blow mold extends into the air injection needle from the inner diameter of the opening, and the air injection needle penetrates into the interior of the hot melt adhesive blank and inflates it, and the hot melt adhesive blank expands and finally fits the inner cavity of the blow mold to form the barrel body. At this time, the outer side wall of the expanded hot melt adhesive blank will be wrapped around the connecting structure of the opening, and as the hot melt adhesive blank cools, the opening and the barrel body are combined into a whole.

[0021] By adopting the above technical solution, the blowing mechanism injects air into the hot melt adhesive blank between the first mold and the second mold through the air injection needle, so that the hot melt adhesive blank is completely fitted into the inner cavity of the blow mold to form a barrel body. At the same time, the hot melt adhesive blank will be wrapped around the connecting structure of the opening, and since the hot melt adhesive blank and the opening are made of the same material, the barrel body after cooling will form a whole with the opening. Since the structural strength of the opening is qualified, the qualified rate of the plastic barrel is greatly improved.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. First, use the manufactured injection mold and injection molding machine to process the opening, and then place the qualified opening on the positioning groove in the blow mold. Then the extruder extrude the hollow hot melt adhesive embryo into the blow mold. Then the blowing mechanism blows air into the hot melt adhesive embryo. The hot melt adhesive embryo expands and gradually fits the opening until the hot melt adhesive embryo completely fits the inner cavity of the blow mold. At this time, the opening is at room temperature, so the volume will not change. However, the local outer wall of the expanded hot melt adhesive embryo will wrap around the connecting structure of the opening. Since the opening and the hot melt adhesive embryo are made of the same material, when the hot melt adhesive embryo cools, the opening will be solidified on the barrel body formed by the cooling of the hot melt adhesive embryo. The plastic barrel formed in this way has qualified structural strength of the opening, which greatly reduces the deformation of the opening of the produced plastic barrel, thereby improving the qualified rate of the plastic barrel. 2. Workers first assemble multiple parts to form an injection molding chamber. Then, the injection molding machine injects molten material into the injection molding chamber through the injection tube. When the molten material cools, workers disassemble the multiple parts and remove the opening formed by cooling. They then trim the opening to obtain a qualified opening, thereby controlling the structural strength and stability of the final opening on the plastic barrel. 3. The blowing mechanism injects air into the hot melt adhesive blank between the first mold and the second mold through the air injection needle, so that the hot melt adhesive blank is completely fitted into the inner cavity of the blow mold to form the barrel body. At the same time, the hot melt adhesive blank will be wrapped around the connecting structure of the opening. Since the hot melt adhesive blank and the opening are made of the same material, the barrel body will form a whole with the opening after cooling. Since the structural strength of the opening is qualified, the qualified rate of the plastic barrel is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of a plastic barrel in the background technology.

[0024] Figure 2 This is a process flow chart for processing plastic barrels according to an embodiment of the present application.

[0025] Figure 3 It is a structural schematic diagram of the opening portion in an embodiment of the present application.

[0026] Figure 4 It is a structural diagram used to reflect the positional relationship between the base plate, injection molding machine and injection molding tube in the embodiment of the present application.

[0027] Figure 5 It is a structural diagram used to reflect the positional relationship between the bottom plate, the right intermediate plate and the top plate in the embodiment of the present application.

[0028] Figure 6 It is a structural diagram used to illustrate the positional relationship between the first mold, the second mold and the water cooler in the embodiment of the present application.

[0029] Figure 7 It is a cross-sectional view used to illustrate the positional relationship among the extruder, the second mold, and the gas injection needle in the embodiment of the present application.

[0030] Figure 8 It is a cross-sectional view used to reflect the positional relationship between the first mold, the second mold and the barrel body in the embodiment of the present application.

[0031] Explanation of reference numerals: 1. injection molding machine; 2. extruder; 3. plastic barrel; 31. barrel body; 32. opening; 321. through pipe; 322. bottom frame plate; 33. thread; 34. connecting structure; 341. connecting tooth; 342. connecting strip; 4. injection mold; 401. injection molding table; 402. bottom plate; 403. left intermediate plate; 404. right intermediate plate; 405. top plate; 406. injection groove; 407. injection plate groove; 408. through column; 409. injection molding chamber; 410. locking screw; 411. locking groove; 412. Claw nut; 413, plug hole; 5, blow mold; 51, first mold; 52, second mold; 53, water cooler; 54, runner; 55, water cooling hose; 6, positioning groove; 7, hot melt adhesive blank; 8, blowing mechanism; 81, air injection needle; 82, blower; 83, blowing hose; 84, piercing cylinder; 9, injection tube; 10, driving part; 101, blow molding table; 102, vertical plate; 103, oil cylinder; 104, guide column; 11, suction mechanism; 111, suction cylinder; 112, vacuum pump; 113, vacuum hose. DETAILED DESCRIPTION

[0032] The following is combined with Figure 2-Figure 8 This application is described in further detail.

[0033] The embodiment of the present application discloses a plastic barrel processing technology.

[0034] Reference Figure 2 , a plastic barrel processing technology includes the following steps: S1. Modeling of the plastic barrel 3: Based on the dimensions and wall thickness of the design drawing of the plastic barrel 3, a 3D model of the plastic barrel 3 is created using 3D software at a 1:1 ratio. Simultaneously, the 3D model of the plastic barrel 3 is optimized using the 3D software according to the mold design concept. S2. Disassembling the plastic barrel 3: Using 3D software, disassemble the 3D model of the plastic barrel 3 into the 3D models of the barrel body 31 and the opening 32. Then, based on the designed wall thickness of the barrel body 31 on the design drawing, design a connecting structure 34 on the opening 32 for connecting to the barrel body 31. Reference Figure 2 The opening portion 32 includes a through pipe 321 and a bottom frame plate 322. The through pipe 321 passes through both sides of the bottom frame plate 322. The bottom frame plate 322 is integrally formed at one end of the through pipe 321. A thread 33 is provided on the circumferential outer wall of the through pipe 321. The connecting structure 34 includes connecting teeth 341 and connecting strips 342 integrally formed on the bottom frame plate 322. The connecting teeth 341 are used to be embedded in the wall thickness of the barrel body 31, and the connecting strips 342 are used to be pre-buried in the wall thickness of the barrel body 31.

[0035] S3. Design of the injection mold 4 for the opening 32: Based on the characteristics of the through tube 321 on the opening 32 being open at both ends and having threads 33 on the circumferential outer side, multiple components are assembled together to form an injection cavity 409 for injecting the opening 32. In addition, an injection tube 9 is designed on one of the components for communicating with the discharge end of the injection molding machine 1. The end of the injection tube 9 facing away from the injection molding machine 1 is connected to the injection cavity 409. Reference Figure 4 and Figure 5 The injection mold 4 includes an injection table 401, a bottom plate 402, a left intermediate plate 403, a right intermediate plate 404 and a top plate 405. The left intermediate plate 403 and the right intermediate plate 404 are both located between the bottom plate 402 and the top plate 405. An injection groove 406 for forming the outer thread 33 of the through pipe 321 is provided between the left intermediate plate 403 and the right intermediate plate 404.

[0036] Reference Figure 5 The bottom plate 402 is provided with an injection plate groove 407 for forming the bottom frame plate 322, and a through column 408 is integrally formed at the injection plate groove 407 on the bottom plate 402, and the top plate 405 is provided with a plugging hole 413 for the through column 408 to be plugged in.

[0037] Reference Figure 4 and Figure 5 The through column 408 is used to form the inner diameter of the through tube 321 of the opening 32. The left intermediate plate 403, the right intermediate plate 404 and the top plate 405 are all slidably arranged on the injection molding table 401. The top plate 405 slides along the axial direction of the through column 408. The left intermediate plate 403 and the right intermediate plate 404 slide along the axial direction perpendicular to the through column 408. The left intermediate plate 403 and the right intermediate plate 404 slide toward or away from each other, and the injection molding tube 9 is welded to the bottom plate 402.

[0038] Reference Figure 4 and Figure 5 When the bottom plate 402, the left intermediate plate 403, the right intermediate plate 404 and the top plate 405 are assembled together, the bottom plate 402, the left intermediate plate 403, the right intermediate plate 404 and the top plate 405 together form an injection molding chamber 409. A locking screw 410 is rotatably connected to the bottom plate 402, and a locking groove 411 for the locking screw 410 to rotate is provided on the top plate 405. A clevis nut 412 is connected to the thread 33 on the locking screw 410, and the clevis nut 412 is used to abut the side of the top plate 405 facing away from the bottom plate 402.

[0039] S4. Design of the blow mold 5 for the barrel body 31: Decompose the three-dimensional model of the barrel body 31 into two easily demoldable components. Then, design a first mold 51 and a second mold 52 based on the structures of the two components. Design a positioning groove 6 for the opening 32 on the first mold 51. Then, design a driving member 10 to drive the first mold 51 to reciprocate toward or away from the second mold 52. Reference Figure 6 The driving part 10 includes a blow molding table 101, two vertical plates 102 are welded on the blow molding table 101, the first mold 51 and the second mold 52 are between the two vertical plates 102, and the two vertical plates 102 are bolted with a cylinder 103 electrically connected to the control system, and the first mold 51 and the second mold 52 are welded with a guide column 104.

[0040] Reference Figure 6 The axis of the guide column 104 is parallel to the axis of the piston rod of the cylinder 103 , the guide column 104 slides through the vertical plate 102 , the first mold 51 is bolted to the piston rod of one cylinder 103 , and the second mold 52 is bolted to the piston rod of the other cylinder 103 .

[0041] Reference Figure 6 、 Figure 7 and Figure 8 The blow mold 5 also includes a water cooler 53 bolted to the blow molding table 101. The first mold 51 and the second mold 52 are both provided with a flow channel 54 for liquid flow. A water cooling hose 55 is connected between the flow channel 54 and the water cooler 53.

[0042] S5. Physical mold production: Based on the 3D model of the injection mold 4 and the 3D model of the blow mold 5, select the materials for making the molds. According to the dimensions of the injection mold 4 and the blow mold 5, use professional processing equipment to produce the injection mold 4 and the blow mold 5 of corresponding dimensions; S6. Forming the opening 32: Connect the injection mold 4 and the injection molding machine 1 via the injection tube 9. The injection molding machine 1 can be an injection molding device in the prior art. The injection molding machine 1 injects molten material into the injection cavity 409 of the injection mold 4 via the injection tube 9. After the injected molten material cools, the opening 32 is removed and the surface structure of the opening 32 is preliminarily trimmed. S7. Inspection and installation of the opening 32: Using dedicated testing equipment, the size, thickness, and surface threads 33 of the opening 32 after preliminary trimming are inspected, and qualified openings 32 are selected. The qualified openings 32 are then installed in the positioning grooves 6 on the first mold 51. S8, the combination of the barrel body 31 and the opening 32: the extruder 2 extrude the internal hollow hot melt adhesive blank 7 to the space between the first mold 51 and the second mold 52. The hot melt adhesive blank 7 and the opening 32 are made of the same material. Then the two oil cylinders 103 drive the first mold 51 and the second mold 52 to gradually approach each other until the first mold 51 is closed on the second mold 52. At this time, a section of the internal hollow hot melt adhesive blank 7 is clamped between the first mold 51 and the second mold 52. The suction mechanism 11 on the first mold 51 will extract the air between the first mold 51 and the second mold 52. Due to the pressure difference between the inside and outside of the hot melt adhesive blank 7, The hot melt adhesive blank 7 will continue to expand and eventually adhere to the bottom frame plate 322 of the opening 32. At this time, the blowing mechanism 8 on the blow mold 5 extends from the inner diameter of the opening 32 into the air injection needle 81. The air injection needle 81 penetrates the interior of the hot melt adhesive blank 7 and inflates it. The hot melt adhesive blank 7 continues to expand and eventually adheres to the inner cavity of the blow mold 5 to form the barrel body 31, until the hot melt adhesive blank 7 is completely adhered to the inner cavity of the blow mold 5. At this time, the connecting strip 342 on the bottom frame plate 322 is completely wrapped by the outer wall of the expanded hot melt adhesive blank 7. At the same time, the tooth gaps of the connecting teeth 341 are filled with the expanded hot melt adhesive blank 7. Reference Figure 6 and Figure 7 The suction mechanism 11 includes an air suction cylinder 111 welded to the first mold 51 and having a hollow interior and an open end. The open end of the air suction cylinder 111 is connected to the positioning groove 6. An air pump 112 electrically connected to the control system is bolted to the blow molding table 101. An air suction hose 113 is connected between the air suction cylinder 111 and the inner side wall of the air suction cylinder 111.

[0043] Reference Figure 6 and Figure 8 The blowing mechanism 8 also includes a blower 82 bolted to the blow molding table 101 and electrically connected to the control system. A blowing hose 83 is connected between the blower 82 and the air injection needle 81. A puncture cylinder 84 electrically connected to the control system is bolted to the suction cylinder 111. The air injection needle 81 slides through the closed end of the suction cylinder 111 and is bolted to the piston rod of the puncture cylinder 84.

[0044] S9, cooling and trimming: The water cooler 53 cools down the first mold 51 and the second mold 52. Through heat transfer, the hot melt adhesive blank 7 is quickly cooled and forms a whole with the opening 32, eventually forming the plastic barrel 3. Afterwards, the plastic barrel 3 is taken out and the excess material is trimmed and removed.

[0045] The implementation principle of a plastic barrel 3 processing technology in an embodiment of the present application is: first, a three-dimensional model of the plastic barrel 3 is established using three-dimensional software, and then the three-dimensional model of the plastic barrel 3 is optimized according to the principle of mold design. After that, the three-dimensional plastic barrel 3 model is disassembled into a barrel body 31 model and an opening 32 model, and then the connecting teeth 341 and the connecting strips 342 are designed on the opening 32 according to the wall thickness of the barrel body 31.

[0046] According to the designed three-dimensional barrel body 31 model and opening 32 model, an injection mold 4 model for making the opening 32 and a blow mold 5 model for forming the opening 32 on the barrel body 31 are designed respectively. Then, according to the size of the injection mold 4 model and the size of the blow mold 5 model, the materials used to make the molds are used and professional processing equipment is used to produce the injection mold 4 and blow mold 5 of corresponding sizes.

[0047] The injection mold 4 and the injection molding machine 1 are connected by the injection tube 9. The injection molding machine 1 injects the material heated to a molten state into the injection cavity 409 of the injection mold 4. When the material in the injection cavity 409 cools down, the injection-molded opening 32 is taken out, and the surface of the injection-molded opening 32 is preliminarily trimmed. Finally, it is tested by special testing equipment to screen out openings 32 of qualified quality.

[0048] The opening 32 of qualified quality is placed on the positioning groove 6 on the first mold 51, and then the extruder 2 extrude the internal hollow hot melt adhesive blank 7 to between the first mold 51 and the second mold 52. As the two cylinders 103 drive the first mold 51 and the second mold 52 to gradually approach and abut, a section of the internal hollow hot melt adhesive blank 7 will be clamped between the first mold 51 and the second mold 52.

[0049] The control system starts the vacuum pump 112, which continuously exhausts the air between the first mold 51 and the second mold 52 through the vacuum hose 113 and the suction cylinder 111. At this time, a pressure difference is generated between the inside and outside of the hot-melt adhesive blank 7, and the hot-melt adhesive blank 7 continues to expand. After a period of time, this time is determined by workers through continuous experiments based on the specific mold model, and the hot-melt adhesive blank 7 abuts the bottom frame plate 322 of the opening 32.

[0050] Subsequently, the control system starts the puncture cylinder 84, and the piston rod of the puncture cylinder 84 drives the air injection needle 81 to penetrate into the expanded hot melt adhesive embryo 7. Then the control system starts the blower 82, and the blower 82 continuously injects air into the hot melt adhesive embryo 7 through the blowing hose 83 and the air injection needle 81. The hot melt adhesive embryo 7 continues to expand until the hot melt adhesive embryo 7 is completely fitted into the inner cavity of the blow mold 5.

[0051] At this time, the connecting strip 342 on the bottom frame plate 322 is completely wrapped by the outer wall of the expanded hot melt adhesive blank 7. At the same time, the tooth gaps of the connecting teeth 341 will be filled with the expanded hot melt adhesive blank 7, and the excess air in the hot melt adhesive blank 7 will be discharged into the suction cylinder 111 through the gap between the hot melt adhesive blank 7 and the air injection needle 81. Then, the water cooler 53 cools the first mold 51 and the second mold 52 through the water cooling hose 55.

[0052] The hot melt adhesive blank 7 is continuously cooled by heat transfer. Since the hot melt adhesive blank 7 and the opening portion 32 are made of the same material, the cooled hot melt adhesive blank 7 and the opening portion 32 form a whole. Finally, the worker trims off the excess part of the plastic barrel 3. During this process, since the quality of the opening portion 32 is qualified, the qualified rate of the produced plastic barrels 3 is greatly improved.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A plastic barrel (3) processing technology, characterized by: The specific steps are as follows: S1. Modeling of plastic barrel (3): using 3D software to make a model of plastic barrel (3); S2. Decomposition of the plastic barrel (3): Decomposing the barrel body (31) and the opening (32) using a three-dimensional software using the plastic barrel (3) model, and designing a connection structure (34) on the opening (32) for connecting with the barrel body (31); S3. Design of the model of the injection mold (4) for the opening (32): Designing a three-dimensional model of the injection mold (4) for the opening (32) required for injection molding the opening (32) using three-dimensional software; S4. Design of a blow molding mold (5) model for the barrel body (31): Designing a three-dimensional model of the blow molding mold (5) required for blow molding the barrel body (31) using three-dimensional software, and designing a positioning groove (6) for accommodating the opening (32) on the three-dimensional model of the blow molding mold (5); S5. Making a physical mold: Using the three-dimensional model of the injection mold (4) and the three-dimensional model of the blow mold (5), an injection mold (4) for producing the opening (32) and a blow mold (5) for molding the opening (32) on the barrel body (31) are made; S6, manufacturing the opening portion (32): using the injection mold (4) and the injection molding machine (1), injection molding a solid opening portion (32); S7. Inspection and installation of the opening portion (32): Using professional testing equipment, the size, thickness and surface condition of the solid opening portion (32) after injection molding are inspected, and then the qualified opening portion (32) is installed on the positioning groove (6) of the blow mold (5); S8, the combination of the barrel body (31) and the opening (32): the extruder (2) extrude the hot melt adhesive embryo (7) with an internal hollow space into the blow mold (5), the hot melt adhesive embryo (7) and the opening (32) are made of the same material, the blowing mechanism (8) on the blow mold (5) blows air into the hot melt adhesive embryo (7), the hot melt adhesive embryo (7) continuously expands and fits the opening (32) on the positioning groove (6), until the hot melt adhesive embryo (7) completely fits the inner cavity of the blow mold (5), at this time, the outer wall of the hot melt adhesive embryo (7) fitting the opening (32) will gradually wrap around the connecting structure (34) on the opening (32) due to expansion; S9, cooling and trimming: The cooling equipment cools down the blow mold (5), and the hot melt rubber blank (7) is continuously cooled and forms a whole with the opening (32), and finally forms a plastic barrel (3). Afterwards, the plastic barrel (3) is taken out and the excess material is trimmed.

2. A plastic barrel (3) processing technology according to claim 1, characterized in that: The steps of modeling the plastic barrel (3) are as follows: according to the size and wall thickness of the design drawing of the plastic barrel (3), the plastic barrel (3) is accurately modeled using three-dimensional software.

3. A plastic barrel (3) processing technology according to claim 1, characterized in that: The steps of disassembling the plastic barrel (3) are as follows: first, the barrel body (31) and the opening (32) are disassembled according to the model of the plastic barrel (3); then, according to the designed wall thickness of the barrel body (31), a connecting structure (34) for splicing with the barrel body (31) is designed on the opening (32).

4. A plastic barrel (3) processing technology according to claim 1, characterized in that: The steps for designing the model of the injection mold (4) for the opening portion (32) are as follows: based on the characteristics that the opening portion (32) is open at both ends and has a thread (33) on the circumferential outer side, multiple parts are assembled together, and the multiple parts are made to jointly form an injection molding chamber (409) for injection molding the opening portion (32), and an injection molding tube (9) for communicating with the discharge end of the injection molding machine (1) is designed on one of the parts, and the injection molding tube (9) is communicated with the injection molding chamber (409).

5. A plastic barrel (3) processing technology according to claim 1, characterized in that: The steps for designing the barrel body (31) blow molding mold (5) model are as follows: decomposing the three-dimensional model of the barrel body (31) into two parts that are easy to demold, then designing a first mold (51) and a second mold (52) according to the structures of the two parts, and designing a positioning groove (6) for placing the opening (32) on the first mold (51), and then designing a driving member (10) for driving the first mold (51) to reciprocate towards or away from the second mold (52).

6. A plastic barrel (3) processing technology according to claim 1, characterized in that: The steps of making the solid mold are as follows: selecting the material for making the mold, and using professional processing equipment to make the injection mold (4) and the blow mold (5) of corresponding sizes according to the sizes of the injection mold (4) and the blow mold (5).

7. A plastic barrel (3) processing technology according to claim 1, characterized in that: The steps for making the opening (32) are as follows: injecting molten material into the injection mold (4) through an injection molding machine (1); after the injected molten material cools down, taking out the opening (32) and performing surface structure trimming.

8. A plastic barrel (3) processing technology according to claim 1, characterized in that: The steps of combining the barrel body (31) and the opening portion (32) are as follows: first, the qualified opening portion (32) is placed on the positioning groove (6) of the first mold (51); then, the hot melt adhesive embryo (7) extruded by the extruder (2) is lowered between the first mold (51) and the second mold (52); then, the driving member (10) drives the first mold (51) and the second mold (52) to approach each other; finally, the first mold (51) and the second mold (52) pinch off the hot melt adhesive embryo (7); and the blow mold (5 ) is extended into the air injection needle tube (81) from the inner diameter of the opening portion (32), and the air injection needle tube (81) penetrates into the interior of the hot melt adhesive embryo (7) and inflates it. The hot melt adhesive embryo (7) expands and finally fits into the inner cavity of the blow mold (5) to form the barrel body (31). At this time, the outer wall of the expanded hot melt adhesive embryo (7) will be wrapped around the connecting structure (34) of the opening portion (32). As the hot melt adhesive embryo (7) cools, the opening portion (32) and the barrel body (31) are combined into a whole.

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